Electrostatic condenser



March 16,1926. 1,576,829 F. O. JOHNSON ELECTROSTATIC- commnsna Filed August 23, 1924 Y j'zaevz a'r Plea ant. 1e,'1 9z6,

rim-MK:-

Chicago, in t 5 of; Illi1iQis'5eh i to useful o eine-rt' n L i d enseis 10f fgwl lfch following. 1813 full,v

3 011;- descrlptio i withithe plates atthe inarginsjot the open 1; It isnth ef general objectgof my. in-

i r 'ifentien fto 'jreduc'eg as fa-r' as possible, the

' capacity-relationor; eendenser effect between the n etallie postsgand the metal end plates and the surfaceleakage between these ar-ts; Absorption losses Wh1ch may arisc itl ftani makes employed; is lredueedby re-' duein-g {the velunie I of material in the bush- The capacity 'be'tween the posts: and plates is alsoreduced 'iby" increasing 'thefdistanee:

between the posts andi plates, introducing air' gaps betw'een the; bushings an (l,thc

plates, and 'byjhaving the engaged surfaces of gtl e bushings *and plates'of less; depth tha n'the thickness of the plates; 'More'gene'rally fstated, the, 'bushings jof insulating 3s areas-rotContact being less surfaces-of the openings; M vp The: invention .gWlll beimore fully, ex-

" ',in"separated;relation.e l

5 The condenser illustrated;ineludeson-e side formed "eta; plurality of triangular" metal plates l which j'are held inspaced apart relation by ineans: offmetallieposts- 2 formed Q site-e e bstatldc I ssembl g posts, 3 a bushings o f in i the, 'posts;'an d each condenserside being'equalt0.'the spaces between. the; plates of 7; the '1 other vcondenser *eugh the .bushings if insulation ef' cer-,-,

I ings With the resultthatwthe nininiu'nr ca-i paeity edit the condenser isifurtherlreduced;

plain'ed in connection with "the accompany I with areiiate; J reeessesT "or; slots a, 3' receiving said condenser plates and s o'spaced' apart asto maintain these plates in su table'spaced ma sa es; 4 7 1 i ffi a. aliigii st has, T1924 at 723x48.

caisson; on eHaeaeo-,::1 1N0is','AssI=e-Nen mo Rama-non: DIE & amma mimorspa; eoemaAmren -onimmerse I r sapafit' relations The metallic posts 2 Q i through thick triangular metal endfvplates held": in' assembly therewith by p ine'ans ofthemetallic nuts 5 threaded upon;

the rods in p irs, each end plate beingire ceiiied between the nut-sofa pain-,The

remaining] condenser side, comprises a pluiralitf-y of metal plates 6 a which are mounted upensa inietalliepost 7 which passes through openingsfi forined thronghthe end. plates The; plates 6' are alternated with theplates'l, the space between the pl ate'sof side" The'post 7 is journaled inrthebearings- 9' and 10.; The bearing -f9 is serewecb within the bushing-lief insulating material,

that is carried by one. effithe-gplates 5i jlwithin the opening thereof' "This bushing has a flange 12 engagingthe inner sideof the plate 4 which @Ollt-alnS i1t',:-there being an insulating Washer 13, upon the other side corresponding end plate 4 by infli Q nuts 14' which are serewednpon the heating 9,

Thebearing lO is coni'eally and outwardly tapered "upon its' exterior to V be received V I within the correspondingly 'shape'd bore oi" the bushing 150f insulating material; This bushing'has a flange 16 which is pressed outwardly npon'jby thelarger portion- 7 of the shaft 7., The condenser illustrated is thusa variablejoi adjustable condenser, to material do, not fillithe fepenings in the; plates} Which receives I these a bushings, the thanthe wall" Which'endthe post 7'is also a shaft turning within the bearings 9 and 10 and having a knob; not shown, to permit ofitsturning. Theinvention, however, is not tolbe limited 1 .to an adjustable condenser. a

- The openings-8 are preferably of siinilar shape in both of the plates 4-, the bushings of insulation that are within these openings being-so shaped as only partially to fill thev I same. In the preferred embodiment of the HlVGIItlOII each of the bushings oil-insulatmg material has a c rcular or cylindrical perimeter and the opening; receiving each J p bushing desirably has four equi-distant en- :largernents 8 distributed aronnd theibush ing -to be located at four sides thereof, whereby air gaps are introduced between portions ofthe bushings and the adjacent sides of thebpening whereby the capacity 7 relation between the n etal'pos't 7 and each endplate is materially reduced, while, at U the same .Jti ne, the su- -fa'ce lea kage over the b'ushlngs and the .fianges and: also over the ly vasher 1-3 is materially reduced.

: The bushings, and the insulating 10' ducied by re I g asoni of the construction illus ,fasfdescribed; I also' ina-ke the; en'gagd suriae'f'ofi the,bufshings an'd platesless in depth than the thicknessofftheplates, 1 In the pre-' .vfe1 red enibodinienb 'of'jfghe Qinve'nti on this result is secured by tapering .the imetal of Qjth'ef plates surroui'iding the openings 8 therein towardthe bushings. This charaetenstlc .a 'ldthe rrounding endplates. f

fChang Haying thus. deser'ibedl my invention; I

7 claims- An electric condenserxincluding the two 7 V z lssembl'ed' witlnth, other condenser side, A washe are made fr miinsulati-ng'mateifial'thafin "preferably has P IaCt ICELHY n0 absorptive" 'cha raeteristi'e. V-lf:insulatingniaterial ha'v-ifgagemenfi xifiishffche plate at t'he margin 7 mg appreciableabsorptive effect is fem -ployed, this" efiect would "be "materially rev V a V ana-ir 'gap between a portion of ishe'fbnshr 1* In a, the preferred: embodinnent1 of I the infj Tentibn, in addition to' forming the air' gaps ingbeing reducedfin thiekness;

ofn 'y invention is not to be limited to the g presen'fee 'fofai'i gaps between thei'bushingsheld by engagement with the'plate at f th g V 1 'nmr in'of said opening, thep'ortioin 0f-th'e'- iayrbe-lnade Without departing M sides thereof and a 1neta11ie "pest, assembled 11 withone'eondenser side; arine'tal end platelifl and; a;;,b1 1shi1ng of-insulating material reeei; mg, said 1130817 and rece ved m"- an openin a formed through sa d-plate andheld by en saidfopening, saidbushing'having a circulai pernneter'and said opening bein'g enlarged along one slde of the bushing to 'lntl o duce ingand the. adjacent sideof the opening, the portionof the fpl ate fchat engages i the bus'h'i myname. A H 1 lfRANKjOgJOl-INSON 

